U.N. nuclear watchdog chief Rafael Grossi said on Sunday he was calling an emergency meeting of his agency's 35-nation Board of Governors.

Here’s a look at what Iran’s next move might be.

He added that Iran “reserves all options to defend its sovereignty, interest, and people”.

Trump's attack comes almost exactly a decade after former president Barack Obama sealed a deal in which Iran drastically scaled back its nuclear work

"From the beginning of the operation, I promised you that Iran's nuclear facilities would be destroyed, one way or another."

"There is therefore no danger for the inhabitants living around the ... sites."

The reaction of world leaders after US forces struck three Iranian nuclear sites

Statements from key lawmakers

Trump earlier said US forces bombed Iran nuclear sites

Israeli Prime Minister Benjamin Netanyahu said Israel had agreed to Trump's ceasefire proposal

Trump said the United States struck three main Iranian nuclear sites: Fordo, Natanz and Isfahan, with the former being hit with a "full payload of bombs."

"There is a growing risk that this conflict could rapidly get out of control"

Trump says Iran nuclear sites 'obliterated'

Fars news agency said: "The air defenses of Isfahan and Kashan began to work to counter hostile targets, and several explosions were heard simultaneously."

Reuters had reported earlier on Saturday the movement of B-2 bombers

Trump ended his posting saying, "Now is the time for peace."

An Israeli attack on Saturday in Iran's west killed at least five army personnel and wounded nine others, Iranian media reported

It was unclear whether the bomber deployment is tied to Middle East tensions

"We warn that sending any military or radar equipment by boat or aircraft from any country to assist the Zionist regime will be considered participation in the aggression against Islamic Iran and will be a legitimate target for the armed forces."

For more than a week, Israel has been carrying out waves of air attacks on Iranian targets in the foes' worst confrontation in history